Stapling tool, especially guiding means for the driver thereof



H. E. BADE 3,140,492 L, ESPECIALLY GUIDING MEANS THE DRIVER THEREOF July 14, 1964 STAPLING Filed Jan. 12, 1962 2 Sheets-Sheqt 1 INVENTOR.

FIG-3 HEINZ E BADE July 14, 1964 H. E; BADE STAPLING TOOL, ESPECIAL 3,140,492 LY GUIDING MEANS FOR THE DRIVER THEREOF 2 Sheets-Sheet 2 Filed Jan. 12, 1962 FlG-4 FIG-5 INVENTOR.

HEINZ E. BADE United States Patent 3,140,492 STAPLING TOOL, ESPECIALLY GUIDING MEANS FOR THE DRIVER THEREOF Heinz E. Bade, Hamburg-Garstedt, Germany, assignor to Joh. Friedrich Behrens, Bogenstrasse, Ahrensburg (Holstein), Germany Filed Jan. 12, 1962, Ser. No. 165,925 Claims priority, application Germany Jan. 13, 1961 2 Claims. (Cl. 144.4)

The present invention relates to portable staplers and, more specifically, to guiding means for the staple driver of such staplers. Numerous staplers are known of the general type described for instance in US. Patent 2,983,922 in which the driver is actuated to drive a staple withdrawn from a magazine into a wall, furniture piece, or the like.

The heretofore known staplers of the general character involved have the drawback that in case of jamming of a staple, which occurs from time to time, it is relatively difficult to remove the jammed staple.

Another drawback of these heretofore known staplers of the type involved consists in that the guiding means for the driver is subjected to undue wear.

It is, therefore, an object of the present invention to provide guiding means for the driver of a stapler, which will overcome the above mentioned drawbacks.

It is'another object of this invention to provide guiding means for the driver of a stapler which can easily and quickly be replaced.

It is also an object of this invention to provide guiding means for a staple driver which will make it possible in case of jamming of a staple to remove the same quickly and easily without the necessity of employing special tools.

These and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawings, in which:

FIG. 1 represents a central vertical longitudinal section through the head of a compressed air operable stapler.

FIG. 2 is a cross section taken along the line IIII of FIG. 1.

FIG. 3 is a section taken along the line III--III of FIG. 1.

FIG. 4 is a section taken along the line IV-IV of FIG. 1.

FIG. 5 illustrates the arrangement of FIG. 1 in an exploded view.

The arrangement according to the present invention is characterized primarily in that a face member which together with an extension of the stapler forms a driver guide to be mounted on the stapler has its upper portion together with the stapler head connected so as to be in alignment with said extension. This arrangment makes it possible merely upon loosening of a few connecting screws to remove said face member and the upper guiding part from the stapler head whereby the guiding path for the driver will be accessible in a simple manner and will allow the exchange of guiding members if necessary.

The invention also concerns the construction of the continuous guiding means for the driver in the lower portion of the driver head in connection with that portion of the guiding means which is to be mounted on the tool. More specifically, for purposes of guiding the driver in the lower portion of the tool, there is provided a cup-shaped part provided with a slot which is positively secured as to its circumferential location by a protrusion between the stapler head and the lower guiding means for the driver. Also this upper portion of the guiding means may after loosening the connecting screws for the lower guiding means and after removal of said screws easily be removed from the tool.

Referring now to the drawings in detail, FIGS. 1 and 3 illustrate the lower end of a customary stapler cylinder 1 3,140,492 Patented July 14, 1964 which for instance may be of the design described in US. Patent 2,983,922. The piston (not illustrated) is recip rocably mounted in said cylinder 1 and has connected thereto a staple driver 2 which latter due to compressed air acting on the piston may be moved downwardly. Into the lower end of the cylinder 1 there is screwed a bottom member 3. Connected in any convenient manner to said bottom member 3 is an extension 4 which in its turn has connected thereto, for instance by welding, the fixed upper portion 5 of a magazine which extends at a right angle to the driving direction of the driver 2. This magazine contains U-shaped staples 8 and is of a trough-like cross section being open toward the bottom as will best be seen from FIG. 2. Member 4 has each of its legs 4a (FIGS. 3 and 5) laterally engaging the upper portion 5 of the magazine. The magazine is closed at the bottom portion by a longitudinally displaceable bottom 6 with a rail 7 on which the staples 8 are displaceable by a slide 9 in a manner known per se, for instance by a spring 9a. The front endof bottom 6 which latter is by means of a snaplock 6a (FIG. 1) held in its operative position, has fixedly connected thereto a downwardly projecting extension 10 forming a lower portion of the guiding means for the driver 2. The face member of said guiding means consists of a plate 11 which latter has on its inside a recess 12 which together with the end face of the extension 10 confines a slot in which the driver 2 is guided during its driving and return stroke. The recess or passage 12 is open toward the magazine so that each time a staple 8 may be pushed into the path of the driver 2. The upper portion of the driver guiding means also comprises an additional guiding member in the form of a U-shaped yoke 13 mounted on the magazine 5 and having its legs 14 embrace the side walls of the magazine 5 as is clearly shown in FIG. 4. The legs 14 by means of protruding portions 15 positively engage a recess in plate 11 as will be evident from FIG. 4. The face member 11 and yoke 13 have their upper end faces located at the same level and together with inclined surfaces 16 form the entrance opening for the driver 2. The face member 11 and yoke 13 are detachably connected to the stapler and, more specifically, are connected to each side of magazine 5 by means of head screws 17 which extend through bores of the portions 11 and 13 respectively and threadedly engage a corresponding thread provided in legs 4a of the cylinder bottom member 3 which legs laterally straddle the magazine 5. For purposes of guiding the driver 2 during its upward and downward movement, the cylinder bottom member 3 has connected thereto an inverted cup-shaped insert 18 the end face wall of which is provided with a slot 19 for the passage of the driver 2 (FIG. 1). By means of a segmental protrusion 20 (FIGS. 1, 3) at the lower portion of insert 18, the latter extends between the member 4 and yoke 13 and positively engages these parts and secures the same against rotation. In this way, the parts 4 and 13 firmly locate the insert 18 in radial direction and in the correct position of its slot 19. By means of its flange 21 and the thrust of return spring 22 for the driving piston, the insert 18 is held against the bottom member 3 and in this way is also properly located in axial direction. In view of the detachable location by means of screws 17, the parts 11 and 13 of the driver guiding means may easily be detached so that any jamming can be overcome in a simple manner and without any other tool but a screw driver. In many instances such jamming can be alleviated and overcome by a mere withdrawal of the magazine bottom portion 6 and thus of the extension 10. The replacement of the parts 11, 13 and 14 in case they have Worn out is likewise extremely simple as will be evident from the above. The construction of the stapler is very favorable in view of the fact that the guidingsurfaces of parts 11 and 13 and insert 18 may be hardened individually.

It is, of course, to be understood that the present invention is, by no means, limited to the particular constructions shown in the drawings but also comprises any modifications within the scope of the appended claims.

What I claim is:

1. In a stapling tool which includes a cylinder and a staple driver having a staple driving end and being reciprocable in and in axial direction of said cylinder: an insert member having a portion thereof detachably inserted in that end portion of said cylinder which is adjacent the driving end of said staple driver, said insert member having a cylindrical bore extending in axial direction of said cylinder, a cylindrical guiding member arranged in said bore and having a slot for receiving and guiding said staple driver, a magazine extending at a substantially right angle to the longitudinal axis of saidcylinder and comprising a first part permanently connected to said insert member and also comprising a second part slidable on said first part from an open position to a closed position and vice versa, said second part having an extension fixed thereto at one end thereof and in said closed position of said second part defining a portion of the path over which the driver moves during its driving operation, said extension extending in axial direction of said cylinder in front of said magazine While leaving space for staples to move out of said magazine into the path of said staple driver, a face plate facing said extension and being detachably connected thereto so as to form therewith a slot in alignment with said driver for receiving and guiding the same, and an additional'mcmber detachably engaging said magazine and having two legs straddling said first part of said magazine and also having an arm extending transverse to and interconnecting said legs, said face plate also having a portion facing said additional member and forming therewith a continuation of said slot, said cylindrical guiding member having an extension for abutment with said additional member, said slot in said guiding member being so arranged with regard to said extension of said guiding member that abutment of said additional member with the extension of said guiding member locates the slot thereof so that it is in alignment with said driver for receiving and guiding the same.

2. A stapling tool according to claim 1, in which said additional member and said face plate are provided with mating, interengaging, shouldered surfaces and with bores on each side of said slot, and screw means extending through said bores and detachably connecting said face plate and'said additional member to said insert member.

References Cited in the file of this patent UNITED STATES PATENTS 2,801,418 Jenny Aug. 6, 1957 2,887,686 Wandel May 26, 1959 2,947,003 Ericsson Aug. 2, 1960 2,983,922 Juilfs May 16, 1961 3,010,430 Allen Nov. 28, 1961 3,040,709 Wandel June 26, 1962 3,041,614 DHaem July 3, 1962 3,058,114 Haubold Oct. 16, 1962 FOREIGN PATENTS 795,759 Great Britain Aug. 6, 1957 

1. IN A STAPLING TOOL WHICH INCLUDES A CYLINDER AND A STAPLE DRIVER HAVING A STAPLE DRIVING END AND BEING RECIPROCABLE IN AND IN AXIAL DIRECTION OF SAID CYLINDER: AN INSERT MEMBER HAVING A PORTION THEREOF DETACHABLY INSERTED IN THAT END PORTION OF SAID CYLINDER WHICH IS ADJACENT THE DRIVING END OF SAID STAPLE DRIVER, SAID INSERT MEMBER HAVING CYLINDRICAL BORE EXTENDING IN AXIAL DIRECTION OF SAID CYLINDER, A CYLINDRICAL GUIDING MEMBER ARRANGED IN SAID BORE AND HAVING A SLOT FOR RECEIVING AND GUIDING SAID STAPLE DRIVER, A MAGAZINE EXTENDING AT A SUBSTANTIALLY RIGHT ANGLE TO THE LONGITUDINAL AXIS OF SAID CYLINDER AND COMPRISING A FIRST PART PERMANENTLY CONNECTED TO SAID INSERT MEMBER AND ALSO COMPRISING A SECOND PART SLIDABLE ON SAID FIRST PART FROM AN OPEN POSITION TO A CLOSED POSITION AND VICE VERSA, SAID SECOND PART HAVING AN EXTENSION FIXED THERETO AT ONE END THEREOF AND IN SAID CLOSED POSITION OF SAID SECOND PART DEFINING A PORTION OF THE PATH OVER WHICH THE DRIVER MOVES DURING ITS DRIVING OPERATION, SAID EXTENSION EXTENDING IN AXIAL DIRECTION OF SAID CYLINDER IN FRONT OF SAID MAGAZINE WHILE LEAVING SPACE FOR STAPLES TO MOVE OUT OF SAID MAGAZINE INTO THE PATH OF SAID STAPLE DRIVER, A FACE PLATE FACING SAID EXTENSION AND BEING DETACHABLY CONNECTED THERETO SO AS TO FORM THEREWITH A SLOT IN ALIGNMENT WITH SAID DRIVER FOR RECEIVING AND GUIDING THE SAME, AND AN ADDITIONAL MEMBER DETACHABLY ENGAGING SAID MAGAZINE AND HAVING TWO LEGS STRADDLING SAID FIRST PART OF SAID MAGAZINE AND ALSO HAVING AN ARM EXTENDING TRANSVERSE TO AND INTERCONNECTING SAID LEGS, SAID FACE PLATE ALSO HAVING A PORTION FACING SAID ADDITIONAL MEMBER AND FORMING THEREWITH A CONTINUATION OF SAID SLOT, SAID CYLINDRICAL GUIDING MEMBER HAVING AN EXTENSION FOR ABUTMENT WITH SAID ADDITIONAL MEMBER, SAID SLOT IN SAID GUIDING MEMBER BEING SO ARRANGED WITH REGARD TO SAID EXTENSION OF SAID GUIDING MEMBER THAT ABUTMENT OF SAID ADDITIONAL MEMBER WITH THE EXTENSION OF SAID GUIDING MEMBER LOCATES THE SLOT THEREOF SO THAT IT IS ALIGNMENT WITH SAID DRIVER FOR RECEIVING AND GUIDING THE SAME. 